This directory holds low-level utility code in the C++ namespace jtutil::.
This code is not specific to this project -- it's things like min/max
templates, multidimensional array classes, fuzzy arithmetic routines, etc.

array<fp>
	is a template class (templated on the integer or floating-point
	type of the array elements) providing multidimensional arrays.
	At present these are stored directly in C++ \code{new[]}-allocated
	storage, but sometime soon I'll add an option to use Cactus
	grid functions or local arrays.

linear_map<fp>
	is a template class (templated on the floating-point type)
	representing a linear map between a contiguous interval of
	integers, and floating-point numbers.

cpm_map<fp>
	is a template class (templated on the floating-point type)
	representing a mapping from the integers to the integers,
	of the form  i --> constant +/- i .  (The name abbreviates
	"Constant Plus or Minus MAP".)

fuzzy<fp>
	(declarations in "util.hh")
	is a template class (templated on the floating-point type)
	providing fuzzy arithmetic, to try to paper over some of the
	effects of floating-point rounding errors.  For example,
	one can write
		for (fp x = 0.0 ; fuzzy<fp>::LE(x,1.0) ; x += 0.1)
		{
		// ...
		}
	and have the loop execute as one would naievly expect,
	even if rounding errors cause the final value of \code{x}
	to be 0.9999999999999999 or 1.000000000000001 or suchlike.

round<fp>
	(declarations in "util.hh")
	is a template class (templated on the floating-point type)
	to do machine-independent rounding of floating point values

norm<fp>
	(declarations in "util.hh")
	is a template class (templated on the floating-point type)
	to the compute 2-, rms-, and/or infinity-norms of a set of
	numbers

miscfp.cc
	(declarations in "util.hh")
	contains various misc floating-point routines

There are also a number of test drivers in the files  test_*.cc .